Rivet



- Jan.27,1948. P. KUBICKI ,K 2,435,144

BIVET Filed Dec. `22, 1944 mv@ mm H /N VENTO R Patented Jan. 27, 1948 :IU N

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Titti Kabine, nbnamnigiafia -orupset to form ahead bl' the axial movement "3 of the said core therein.

Such rivetsare of especial use in the aircraft industry.

In a rivet -ofjthe 'kind set'forth the core is secured to the tubular member by welding or Ainthervvis'e-nxin'g the end Arofthe -sai'd'inemb'er to the underside of the head oftl'e-oread doing there-isusually Aleft ajjsliglrtannular space between the `core and the "wall of the member.

This annular space may be increased when axial movement has' been imparted `Ato Ithe core Y'for the reason Atli'at 1the only Vsatisfactory method of effectingthisinovement is todraw vthe core 'through the tubular member whilst "exerting an opposing thrust thereagainst. This drawing reduces the i diameter of the core.i ,Y y e It has been found in 'practice l'that whernjtliese spaces have been left there is a tendency that the stress is only taken up by the tubular member and the core becomes useless. This is a distinct disadvantage to the use of such rivets.

The object f this invention is to provide an improved construction of rivet whereby the above mentioned disadvantage is obviated.

According to this invention a rivet of the kind set forth is characterised in that both the core and tubular member or sleeve are formed with tapered portions so positioned that when axial movement is imparted to the former the said tapered portions mate and close up and prevent any annular space therebetween and also between the tubular member and the walls of the rivet holes.

The said tapered portions may extend over the whole 0r only a part of each of said core or said tubular member or 'sleeve but should have a length, at least, equal to that of the thickness Vof the parts to be riveted and the coincidence of length and taper be such as to permit during the process of riveting, for the tubular member to be rst collapsed to form the head and later effect the expanding of the tubular member or only simultaneously with the final collapsing of the rivet head to materially reduce the riveting forces that would be required wherein the steps of collapsing and expanding all occur at the same time. It will be therefore apparent that the core and tubular member may be made from the same material for not only reducing their cost of man- Thematikfrhe'iiaddce A is frmdvvith two cylindrical portions B, C of different diameters with an intermediate tapered portion D. The internal surface of the headed tubular member E is partly cylindrical at F and tapered at G. The portion D of core A and the portion G of the tubular member E are of the same taper but if necessary these portions may be of dilerent tapers.

For use the core and tubular member are assembled together as seen in Figure 3 as by welding or otherwise fixing the end of the member E to the underside of the head of the core A.

In Figures 4, 5 and 6, H, H indicate the two plates or members to be riveted together.

It will be seen in Figures 3 and 4 that there is an annular space J between the core A and member E and in Figure 4 also an annular space K between the member E and the walls of the rivet holes in the plates H, H.

In use the rivet as seen in Figure 3 is rst inserted in the coincident holes in the plates H, H as seen in Figure 4. Then the shank B of the core is gripped by a, known compression riveting tool and axial movement is imparted thereto whilst an opposing thrust is exerted against the head of the member E. This operation, as seen in Figure 5, causes the tubular member to collapse or be upset, eliminating the annular spaces J and K. Finally, the protruding shank B of the core is sheared off.

It will be seen that with the elimination of the ufacture, but to permit the same to be more Said annular Spaces 01 gaps the core and tubular mushroom shape or of any other suitable shape.V

In order to prevent the upper surface of the countersunk head of the tubular member E from becoming raised during the riveting action thesaid surface may be slightly dished.

I claim: v.

1. A rivet comprising in combination 'a headed tubular member adapted to extend through an opening within the structure to be riveted, the exterior diameter of said tubular member being less than the diameter of the opening within the structure to be riveted to form a space therebetween, the bore of said headed tubular member having a cylindrical portion and s, tapered portion extending from said cylindrical portion to the headed end thereof, and the smaller diameter of said tapered portion terminating at the headed end of said tubular member, a headed core having a shank portion extending through the bore rivet said tubular member will rst be collapsed to form a head about the headed end of said core and close the space between said core and tubular member and finally expand said tubular member to close the space between the latter and the structure to be riveted.

2. A rivet comprising in combination a, tubular member adapted to extend through the structure to be riveted, a head formed with one end of said tubular member and adapted to be positioned against one face of the structure to be riveted, a

core extending through said tubular member, a

head formed with said core, means for securing the head of said core to said tubular member at 'an end thereof opposite to that to which said head is formed therewith, whereby when axial of said tubular member, a cylindrical portion c formed with the shank of said core and of less exterior diameter than that of the interior diameter of the cylindrical portion of the bore of said tubular member leaving a space therebetween, a, cylindrical portion formed with the shank of said core and of less diameter than that of the first mentioned cylindrical portion of thc shank of said core, an intermediate tapered portion formed with the shank of said core and arranged between the cylindrical portions thereof whereby when axial forces are exerted upon the forces'are'extended upon said core the headed end thereof will rst cause said tubular member PIOTR KUBICKI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,038,189 Morris Apr. 21, 1936 2,061,629 Huck Nov. 24, 1936 2,114,493 Huck Apr. 19, 1938 FOREIGN PATENTS Number Country Date 378,617 Great Britain' Aug. 18, 1932 

